Tool for truing balance-wheels of watches.



Patented Dec`. 2, |902..

R. D.-NELSN. TO0L FOR TRUING BALNCE WHEELS 0F WATCH-ES,

(Applicatiqn filed July 10| 1902;)

(No Model.)

tlrrEn STATES PATENT OFFICE.

ROBERT D. NELSON, OF AKRON, OHIO, ASSIGNOR OF ONE-HALF TO MARSHALL DREW,OF AKRON, OI-IIO.

TOOL. FOR TRUING BALANCE-WHEELS OF WATCHES.

SBEGIFICATION forming part of Letters Patent No. 715,123, dated December2, 1902.

Application filed July l0, 1902. Serial No. 115.009. (No model.)

To @ZZ whom, t may concern.:

Be it known that I, ROBERT D. NELSON, a citizen of the United States,residing at Akron, in the county of Summit and State of Ohio, haveinvented a certain new and useful Improvementin Tools for TruingBalance- Wheels of Watches, of which the following is a specification.

My invention has relation to improvements in tools for Watch-repairersuse, whereby the balance-\vheel may be made accurately true,`

both circumferentially, so that the rim shall be an exact circle, andlaterally, so that the wheel shall be in a true plane at an exact rightangle with its statf, by which latter term is meant its axle.

The object of my invention is to produce a new and improved tool bywhich the foregoing effects may be rapidly, easily, and accuratelysecured.

To the accomplishment of the foregoing effects my invention consists inthe peculiar and novel construction, arrangement, and combination ofparts hereinafter described and then specifically claimed, referencebeing had to the accompanying drawings, which form a part hereof.

In the accompanying drawings, in which similar reference-numeralsindicate like parts in the dierent figures, Figure l is a centralfore-and-a'ft section, Fig. 2 a front elevation, and Fig. S a plan, ofthe top plate hereinafter described.

Referring to the drawings, lis the base, which is preferably the frustumof a truncated cone, in the central portion of the upper face of whichis a central cylindrical recess 2. On top of this base is a circularplate 3, having on its under face a central integral cylindricalprojection 4, that accurately lits the recess 2. In the top of the plate3 is a central cylindrical recess 5, in which fits a cylindrical centralprojection 6, depending from and integral with the circular face-plate7. Through the face-plate 7, projection 6, plate 3, projection 4, andbase is a vertical opening, in which fits a steel rod 8, held at anyelevation by a set-screw 9. From one side of the plate 3 rises an arml0, curved over the plate and terminating in a head 1l, in which is avertical hole to receive a rod l2, held by a set-screw 13 and having around head to form a convenient fingergrip- The parts are so constructedthat the rods 8 and l2 are in accurate alinement and at an exact rightangle with the face-plate 7, and the adjacent ends of these rods arecentrally countersunk to receive the ends of the balance- Wheel staff.

The top of the face-plate 7 has a series of concentric lines at accuratedistances from its center, by which the balance-Wheel can be tested andtrued, and to enable these circles to be more easily read by the eye ora glass every other one may be enameled, as suggested by the alternateheavy and light lines in Fig. 3, the heavy lines indicating enamel andthe lighter ones a tine line in the metal.

In operation the balance-Wheel to be tested and trued is laid on theface-plate 7With the ends of its st-afI" in the couutersunk ends of therods Sand l2. Then its circular accuracy can be tested by the inscribedcircles on the plate, by the eye, or by a right-angled tool resting `onthe plate with its vertical edge close to or touching the edge of theWheel to be tested and any inaccuracies remedied by suitable tools.v Ifit is out of a true plane or not ata right angle with its staff, thiscan also be detected by means of asmall tool 14, having a dependingpoint and adjustably supported in a post 15, attached to the edge of theplate 3, which tool will indicate on the wheel as it is revolved. Toprovide for adilerent view of the balance-wheel When for any reason itis desired, there is a recess 16 in one side of the base l, like therecess 2, to receive the projection 4. Thus the arm l0 and associatedparts can be placed in a diagonal position, and the parts will performtheir respective function in the same manner as when vertical.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

l. An improved tool fortruing balance- Wheels of Watches embodying abase, a plate revolubly mounted thereon having a lateral arm with a headto overhang the center of said plate, a face-plate revolubly mounted onsaid arm-carrying plate, rods in said head and armcarrying and faceplates in alinement with IOO each other having ends arranged to receivethe ends of a balance-Wheel staff and means for adjustably retainingsaid rods in said head and arm carrying plate, substantially as shownand described.

2. An improved tool for truing the balance- Wheels of Watches embodyinga base with a plate revolublv mounted thereon having a lateral arm Witha head overhanging the center of said plate, a face-plate revolublymounted on said arm-carrying plate, rods in said head, arm-carrying andface plates with their axes in alinement having their adjacent endsarranged to receive the statt of a balancewheel, means for adjustablyretaining said rods in position and a post secured to the side of saidarm-carrying plate having adjustably secured therein a tool,substantially as shown and described.

3. An improved tool for truing balance- Wheels of Watches having a basehaving sides at an angle withits top a central circular recess in itstop and a similar recess in its side4 in combination with a plate havinga circular projection on one face to t said recesses, a circular face tofit revolubly on said first plate,

an arm rising from said Iirst plate provided with a head to overhang theface-plate, rods in said head and plates in alinement with each otherhaving ends fixed to receive the ends of balance-Wheel staff,substantially as shown and described.

4. An improved tool for truing balance- Wheels of Watches embodying abase,a revoluble face mounted thereon, an adjustable rod passing throughits center, an overhanging head, a rod in said head, said rods being inalinement, the surface of said face-plate being inscribed withconcentric circular lines, substantially as shown and described.

5. In tools for truing balance-Wheels for watches the combination of arevoluble faceplate, inscribed concentric lines on said plate and enamelbetween alternate circles, substantially as described.

In testimony that I claim the above I hereunto set my hand in thepresence of tWo subscribing witnesses.

ROBERT D. NELSON.

Witnesses:

MARSHALL DREW, C. E. HUMrHnEY.

